Drug & supplement interaction

Ascophyllum Nodosum + Brompheniramine

Brompheniramine brand names: Lodrane, Dimetane.

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated July 2026 · Pair last verified Sep 13, 2026

The bottom line No known interaction

We found no known interaction between Ascophyllum Nodosum and Brompheniramine in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Ascophyllum Nodosum and Brompheniramine

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Brompheniramine and Ascophyllum Nodosum in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Ascophyllum Nodosum safety at a glance

Ascophyllum Nodosu... overall Use caution Generally used in foods, but its iodine content and possible heavy metal contamination warrant caution.

Pregnancy Avoid Avoid due to high iodine levels and possible contaminants that may affect the baby.

Breastfeeding Avoid Avoid because iodine and contaminants can pass into breast milk.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Brompheniramine and Ascophyllum Nodosum? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

How we checked

Why No Interaction Is Listed for Brompheniramine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Brompheniramine is filed under 3 classifications — photosensitizing drugs, seizure threshold lowering drugs, oral drugs. Ascophyllum Nodosum has documented interactions with 3 drug classes — the most serious being amiodarone (cordarone) (moderate), antithyroid drugs (moderate) and thyroid hormone (moderate) — and none of Brompheniramine’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Ascophyllum Nodosum Does Interact With Other Medications

Ascophyllum Nodosum has 22 moderate known drug interactions in our database — Brompheniramine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 22 No known interaction 2,808 (incl. Brompheniramine)

Taking anything else?

Check Another of Your Medications Against Ascophyllum Nodosum

Covers the 2,830 medications we’ve checked against Ascophyllum Nodosum. Pick one to open its full report.

From our Q&A

Questions About Ascophyllum Nodosum or Brompheniramine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Ascophyllum Nodosum or Brompheniramine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Brompheniramine

This page covers Ascophyllum Nodosum only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Brompheniramine page lists 43 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Alfalfa (moderate), Angelica Archangelica (moderate), Arrach (moderate) and Bergamot (moderate).

By severity: 1 major · 32 moderate · 10 minor.

From our pharmacist’s overview on the Brompheniramine page

“Brompheniramine, the sedating antihistamine in Dimetane and many combination cold medicines, deserves genuine care around supplements rather than a quick scan. The single major-rated entry is activated charcoal, which binds drugs in the gut and can sharply cut how much brompheniramine reaches your bloodstream.”

Reviewed by 2 · Jul 18, 2026

Open the Brompheniramine interaction page

One more smart check

Taking Ascophyllum Nodosum as Part of a Dietary Supplement Product? Check It for Interactions

We hold 360 real supplement products containing Ascophyllum Nodosum, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Ascophyllum Nodosum. Even though Ascophyllum Nodosum itself has no known interaction with Brompheniramine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Ascophyllum Nodosum and Brompheniramine Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Ascophyllum Nodosum

Top half

#420 of 1,452 supplements looked up here in the last 7 days

29 days ago today

Medication Brompheniramine

Steady interest

#1,513 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?

Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Ascophyllum Nodosum reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Ascophyllum Nodosum and Brompheniramine records this page draws on were last updated July 10, 2026.
What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.

Data structure & sourcing designed and verified by Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Ascophyllum Nodosum

What is Ascophyllum Nodosum?

Weight management
Blood sugar support
Thyroid support (iodine source)
Digestive health
Source of vitamins and minerals
Joint comfort

Ascophyllum nodosum (often sold as bladderwrack or brown seaweed) is a nutrient-rich algae that people use for weight, blood sugar, and thyroid support, but solid human evidence is limited for most of these uses. Because it naturally contains iodine and can absorb heavy metals like arsenic, it should be used cautiously, and pregnant or breastfeeding people should avoid it unless a doctor approves.

Ascophyllum nodosum · Fucaceae · Whole seaweed (thallus/fronds) · Capsules, tablets, powder, extracts, teas, and topical products

An interaction check asks whether these two react with each other — it does not ask whether Ascophyllum Nodosum is a good idea for someone in your situation. Here is what our Ascophyllum Nodosum record says about it on its own.

Ascophyllum Nodosum: dosing

There is no well-established standard dose of Ascophyllum nodosum. Products vary widely in strength and iodine content, which makes consistent dosing difficult.If you choose to use it, follow the directions on the product label and do not exceed the recommended amount.

From our Ascophyllum Nodosum monograph — the full record covers uses, side effects and every documented interaction.

Read the full Ascophyllum Nodosum monograph & all interactions

Medication

About Brompheniramine

What Is Brompheniramine Used For?

Brand names: Lodrane, Dimetane

Brompheniramine temporarily relieves common allergy symptoms. Both CVS Pharmacy oral liquid and Dimetapp oral solution are used to treat runny nose, sneezing, itching of the nose or throat, and itchy, watery eyes due to hay fever.

See full Brompheniramine drug information

Keep checking

Other Drugs & Ascophyllum Nodosum

Browse every other medication we’ve checked against Ascophyllum Nodosum — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major

22Moderate

0Minor

2,807No known interaction

22 Moderate 2,807 No interaction

Moderate

22 interactions

No interaction 2,807 drugs checked — show the list

We also checked Ascophyllum Nodosum against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,807 medications checked with no known interaction — see the full Ascophyllum Nodosum list.

See the full Ascophyllum Nodosum interactions page

See every supplement checked against Brompheniramine, ranked by severity

Evidence & sources

Ascophyllum Nodosum References

The 5 references that drive our Ascophyllum Nodosum monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
Sterling JB, Heymann WR. Potassium iodide in dermatology: a 19th century drug for the 21st century-uses, pharmacology, adverse effects, and contraindications. J Am Acad Dermatol 2000;43:691-7. PubMed
Combet E, Ma ZF, Cousins F, et al. Low-level seaweed supplementation improves iodine status in iodine-insufficient women. Br J Nutr 2014;112:753-61. PubMed
Simmons-Boyce JL, Purcell SL, Nelson CM, MacKinnon SL. Dietary Ascophyllum nodosum increases urinary excretion of tricarboxylic acid cycle intermediates in male Sprague-dawley rats. J Nutr 2009;139:1487-94. PubMed
Sorge US, Henriksen M, Bastan A, et al. Short communication: Iodine concentrations in serum, milk, and tears after feeding Ascophyllum nodosum to dairy cows-A pilot study. J Dairy Sci 2016;99:8472-6. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Ascophyllum Nodosum and Brompheniramine Together: Common Questions

Is it safe to take Ascophyllum Nodosum with Brompheniramine?

We do not list a known interaction between Ascophyllum Nodosum and Brompheniramine. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.

How was the Ascophyllum Nodosum and Brompheniramine combination checked?

Interactions in our licensed database are recorded against drug classes. Brompheniramine is filed under 3 classifications, and Ascophyllum Nodosum has documented interactions with 3 drug classes — none of Brompheniramine's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.

Does Ascophyllum Nodosum interact with any other medications?

Yes. Ascophyllum Nodosum has 22 documented drug interactions in our database — Brompheniramine is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

Does Brompheniramine interact with any supplements?

Yes. Brompheniramine has documented interactions with 43 supplements in our database — Ascophyllum Nodosum is not one of them. The Brompheniramine interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Ascophyllum Nodosum monograph Uses, safety profile, and every drug interaction in one place Brompheniramine drug information The full plain-English guide to this medication Brompheniramine supplement interactions Every supplement checked against Brompheniramine, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 5 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Brompheniramine and Ascophyllum Nodosum?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.